This adds the initial usage docs and a release note for the
first set of commands available in what will be the 1.0.0
release for the osc-placement plugin in the Queens series.
There are some other changes to the docs layout:
* The cliff.sphinxext is used to get the CLI reference.
* The README is inlined to the top docs index page.
* The usage doc is changed to the user/index.rst format
based on the docs.o.o manuals migration spec.
* The ordering of the contents is also changed based on
the docs.o.o manuals migration spec.
* The modindex is removed since it doesn't exist and since
there are no python API bindings in this library, we don't
need a module index anyway.
Depends-On: Id18aab2a95849bc60769f2f81c363c17d049b21f
Part of blueprint placement-osc-plugin
Change-Id: I552688b9ee32b719a576a7a9ed5e4d5aa31d7b3f
5b39d446be